"ritually fit or pure" (especially of food), 1851, from Yiddish kosher, from Hebrew kasher "fit, proper, lawful," from base of kasher "was suitable, proper." Generalized sense of "correct, legitimate" is from 1896.
例文
1. Acting was not a kosher trade for an upper-class girl.
演技は上流社会出身の女の子にとって適切な職業ではありません。
2.I guessed something wasn 't quite kosher .
ちょっとおかしいと思います。
3.Their business deals are not always completely kosher .